<?php
mb_internal_encoding("UTF-8");

    $str = "我是中国人aa我a";
    $str = mb_str_split($str);
    foreach($str as $v){
        echo($v . " - ");
    }
function mb_str_split( $string ) {
    return preg_split('/(?<!^)(?!$)/u', $string);
}
echo(join('\',\'' , $str));


?>